Deep sleep is the mentally and physically restorative stage of sleep. How much of it do you actually need?

It's often hard to know exactly how much sleep you should be getting. Experts claim most healthy adults need seven to nine hours per night – but this is hardly exact, and it also depends on age and ...

The middle of the night used to be my special time. I’d use it to cram for a test, read a mystery, or play Candy Crush—with no one around. As I got older, those nighttime hours became time to answer ...

Though it might seem like the question "How much sleep do you need" gets a new answer every other week, the The National Sleep Foundation says its new chart breaks the question down like never before.

The NIH’s official sleep table shows the number shifts with every life stage.

With so much to do heading into the busy holiday season, is anyone getting enough sleep? Most sleep experts advise that adults get seven to nine hours of sleep per night for good health and emotional ...

Sleep outranks diet and exercise as a longevity factor, per new research. Here’s what to know and how to act on it tonight. Leon Bennett Getty Images New research is reframing sleep and life ...

We may have protested nap time when we were kids, but as adults, we know sleep is vital. (Anyone else wish they could have nap time during their day job?) Shakespeare called it the “sore labor’s bath, ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. Why do I need to sleep for a long time at night?